55 Cancri d
Planet· orbits 55 Cancri
55 Cancri d - the outermost planet, a cold gas giant of about 4 Jupiter masses on a wide 13-year orbit, one of the first Jupiter-analogue exoplanets found. Its mass is measured; it has never transited, so its size is model-based.
Open in 3D viewSee 55 Cancri d in the live, interactive 3D map
Key facts
Mass
7.36 × 10²⁷ kg
3.88 M♃ (1,233 M⊕)
Year
13.1 Earth years
4,799 Earth days
Distance from 55 Cancri
5.6 AU
Science
Physical
- Mass
- 7.36 × 10²⁷ kg · 3.88 M♃ (1,233 M⊕)
- Radius
- Not measured
- No transit — radius is a model estimate for a ~4-Jupiter gas giant; no density is quoted.
Orbital
- Semi-major axis
- 5.6 AU
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Eccentricity
- 0.091
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Inclination
- 0.00 °
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Orbital period
- 13.14 years
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Perihelion
- 5.09 AU
- Computed from the orbital elements
- Aphelion
- 6.11 AU
- Computed from the orbital elements
- Mean orbital velocity
- 12.7 km/s
- Computed from the orbital elements
Composition
- Bulk composition
- A cold gas giant of true mass ~4 Jupiter — one of the first Jupiter-analogue exoplanets found (2002). Never imaged.
- Cloud appearance
- Appearance based on ESO/M. Kornmesser's artist's concept. No spacecraft has imaged this world, so its real appearance is unknown — The banded clouds shown are a representation of its class, shown only in Visual mode; Realism shows a plain spectral colour.
Radiation & temperature
- Insolation
- 0.0202 S⊕ · 2% of the sunlight Earth receives
- Computed from 55 Cancri's luminosity and the orbital distance (inverse-square; Earth's sunlight = 1).
- Equilibrium temperature
- 105 K (-168 °C)
- Computed model value for its cold 5.6-AU orbit — not measured.
Discovery & history
- Method
- Radial-velocity detection (stellar wobble)
- Name
- Designated 'd' under the IAU convention that letters a star's planets 'b', 'c', 'd'... in the order they are discovered (the star itself is the unwritten 'a').
Announced in 2002, it was among the first exoplanets found on a wide, Jupiter-like orbit around a Sun-like star.
Images
No official imagery available — this object has never been visited and no officially-licensed depiction exists.